Self-cleaning litter box



FIG. 1 is a front elevational view of the self-cleaning litter box of the present invention;

FIG. 2 is a back elevational view of the self-cleaning litter box of FIG. 1;

FIG. 3 is a left side elevational view of the self-cleaning litter box of FIG. 1;

FIG. 4 is a right side elevational view of the self-cleaning litter box of FIG. 1;

FIG. 5 is a top plan view of the self-cleaning litter box of FIG. 1; and,

FIG. 6 is a bottom plan view of the self-cleaning litter box of FIG. 1. 

The ornamental design for a self-cleaning litter box, as shown. 